More auto loans and leases are being cranked out at banks like JPMorgan Chase and Wells Fargo at a time when consumers are piling on more debt — and lengthier loans — to cover new and used car purchases.

JPMorgan saw auto loan and lease origination volume jump by 9 percent year over year, to $8.5 billion, the bank reported in its second-quarter earnings. Overall, the bank said its auto loans and leases rose 17 percent year over year. Wells Fargo also showed an increase in auto originations, with a 2 percent rise year over year and an 8 percent increase from the first quarter of $8.3 billion, it announced in its earnings Friday.

JPMorgan CFO Marianne Lake said Thursday on the bank's earnings call that it has "maintained our underwriting discipline with average FICO scores." Later on the call, when pressed for specifics by an analyst who asked if JPMorgan had applied consistent standards to its auto lending, Lake said only that it has focused on consumers with "very high" scores.

Industry loan average: more than $30,000

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Auto loans aren't the only thing that's growing; their size and duration are on the rise as well this year, according to data from Experian. The average monthly payment, around $500, is up to a record mark, according to a June report from the firm, and the industry's average loan size for new cars is also at an all-time high, having eclipsed the $30,000 mark.